PS:今天上午，非常郁闷，有很多简单基础的问题搞得我有些迷茫，哎，代码几天不写就忘。目前又不当COO，还是得用心记代码哦！

    To perform a query, create the , set up its query, and pass it to the loader framework. From then on, the framework manages everything. It runs the query on a background thread, returns the results to the foreground, and watches for changes to the data associated with the query. http://blog.csdn.net/sergeycao

    Pass a to the loader framework in your implementation of. The loader framework calls this method when youcreate a loader by calling . You can create a anywhere, but the preferred way is to create it in, because this defers creation until the object is actually needed.

    Notice that will only if the doesn't already exist; otherwise, it re-uses the existing. The loader framework tracks instance using theid value passed to .

    

Define and Launch the Query

    每日一道理

微笑，是春天里的一丝新绿，是秋日里的一缕阳光，是骄阳下的一片浓荫，是冬雪中的一株梅红……微笑着去面对吧，你会感到人生是那样的温馨与甜蜜！

    To create a and define its query at the same time, call the constructor. Thecontext and uri arguments are required, but the others are optional. To use the default value for an optional argument, pass innull. The runs the query against the identified by uri, just as if you had called with the same arguments.

    For example:

public Loader
    
      onCreateLoader(int loaderID, Bundle bundle){    /*     * Takes action based on the ID of the Loader that's being created     */    switch (loaderID) {        case URL_LOADER:            /*             * Return a new CursorLoader             */            return new CursorLoader(                this,                           // Context                DataProviderContract.IMAGE_URI, // Provider's content URI                PROJECTION,                     // Columns to return                null,                           // Return all rows                null,                           // No search arguments                null);                          // Default search order        default:            // An invalid id was passed in            return null;    }}
    

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